File:Pteraspis crouchi (fossil fish) (Lower Devonian; Herefordshire, England) (34234547416).jpg

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Pteraspis crouchi Lankester, 1865 - fossil fish from the Lower Devonian of Britain. (FMNH PF1424, Field Museum of Natural History, Chicago, Illinois, USA)

Orientation: dorsal view of head shield; anterior is the left.

Pteraspis is a fossil jawless fish with significant bony armour. The earliest fish lacked jaws. The first jawed fish are Ordovician in age, but they didn't become common until the Devonian. Jaws appeared by evolutionary modification of the anterior set of gill arches. Jawed fish have fewer pairs of gill arches than jawless fish. A few jawless fish still exist in modern oceans - hagfishes and lampreys.

Classification: Animalia, Chordata, Vertebrata, Agnatha, Heterostraci, Pteraspidiformes, Pteraspididae

Locality: unrecorded/undisclosed site in Herefordshire County, western England, southern Britain

See info. at:

<a href="https://en.wikipedia.org/wiki/Pteraspis" rel="nofollow">en.wikipedia.org/wiki/Pteraspis</a>
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Source Pteraspis crouchi (fossil fish) (Lower Devonian; Herefordshire, England)
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/34234547416 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 December 2019

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current19:03, 7 December 2019Thumbnail for version as of 19:03, 7 December 20191,976 × 1,016 (1.82 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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